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Finding the Fourth Proportional to 668.65, 921.65 and 528.52

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Solution

The fourth proportional to 668.65, 921.65 and 528.52 is: 728.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.65 : 921.65 = 528.52 : x
  2. Step 2: Convert to fraction form
    668.65/921.65 = 528.52/x
  3. Step 3: Cross multiply
    668.65x = 921.65 × 528.52
  4. Step 4: Simplify right side
    668.65x = 487,110.46
  5. Step 5: Solve for x
    x = 487,110.46/668.65
  6. Step 6: Final answer
    x = 728.50

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.